@import '../sass/colors.scss';
$w-100:100px;

@mixin bordered {
  border: 1px solid black;
}

    #app {
        width: $w-100;
        height: $w-100;
        background-color: $bk-color;
        @include bordered;
      }
      //群组选择器
      .container{
          h1,
          h2,
          h3{
              margin-bottom: .8em;
          }
      }
      nav{
          border: 1px solid black;
          left: 0px;
          right: 0px;
      }

